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Kinetic, Spectral and Redox Properties of the Transients Formed On One-Electron Reduction of 3, 3, 6, 6-Tetramethyl-3, 4, 6, 7, 9-Pentahydro-10-Phenyl (1, 8) (2H, 5H) Acridine-Dione in Aqueous-Organic Mixed Solvent System: a Pulse Radiolysis Study

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The phenyl substituted acridine-1,8-dione (AD) dye reacts with (CH3)2COH radicals with a bimolecular rate constant of 0.6 x 108 dm3 mol-1 s-1 in acidic aqueous-organic mixed solvent system. The transient optical absorption band (λmax = 465 nm, ε = 6.8 x 102 dm3 mol-1 cm-1) is assigned to ADH* formed on protonation of the radical anion. In basic solutions, (CH3)2*COH radicals react with a bimolecular rate constant of 4.6 x 108 dm3 mol-1 s-1 and the transient optical absorption band (λmax = 490 nm, ε = 10.4 x 103 dm3 mol-1 cm-1) is assigned to radical anion, AD*-, which has a pKa value of 8.0. The reduction potential value of the AD/AD*- couple is estimated to be between -0.99 and -1.15 V vs NHE by pulse radiolysis studies. The cyclic voltammetric studies showed the peak potential close to - 1.2 V vs Ag/AgCl.

Affiliations: 1: Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, INDIA; 2: Department of Inorganic Chemistry, University of Madras, Madras 600 025, INDIA


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